There's a bug fix in 0.84 that we need to fix issues in geoclue so that we can upgrade to the new, long awaited, 0.12 stable release that fixes numerous issues and crashes in geoclue.
Worst case can we have the bugfix back ported but looking at the release notes there doesn't look to be massive changes.

dbus-glib-0.86-1.fc12 has been pushed to the Fedora 12 testing repository. If problems still persist, please make note of it in this bug report.
If you want to test the update, you can install it with
su -c 'yum --enablerepo=updates-testing update dbus-glib'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/dbus-glib-0.86-1.fc12